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Note 10 - Investments in Affiliates and Controlled Investments - Schedule of Controlled Investments (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments, fair value     $ 1,060,474  
Net realized (loss) from security transactions $ 0 $ (11,686,668) (24,169,015) $ (11,686,668)
Net change in unrealized appreciation (depreciation) on investments (20,083) 12,568,856 24,011,904 9,689,744
Investments, fair value 256,934   256,934  
Investments, fair value 256,934   256,934  
Investment, Affiliated Issuer, Controlled [Member]        
Interest 0 $ 20,336 0 $ 80,000
Investment, Affiliated Issuer and Controlled [Member]        
Investments, fair value     315,250  
Interest     0  
Sales/maturity/expiration     0  
Net realized (loss) from security transactions     (24,169,015)  
Investments, fair value $ 197,925   $ 197,925  
Shares held (in shares)    
Investments, fair value $ 197,925   $ 197,925  
Total Affiliates and Controlled Investments     24,011,690  
Investment, Affiliated Issuer [Member]        
Investments, fair value     260,497  
Interest     0  
Net realized (loss) from security transactions     0  
Net change in unrealized appreciation (depreciation) on investments     (88,969)  
Investments, fair value $ 171,528   $ 171,528  
Shares held (in shares)    
Investments, fair value $ 171,528   $ 171,528  
Investment, Controlled [Member]        
Investments, fair value     54,753  
Interest     0  
Sales/maturity/expiration     0  
Net realized (loss) from security transactions     (24,169,015)  
Net change in unrealized appreciation (depreciation) on investments     24,100,659  
Investments, fair value $ 26,397   $ 26,397  
Shares held (in shares)    
Investments, fair value $ 26,397   $ 26,397  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member]        
Investments, fair value     25,287  
Investments, fair value 3,224   3,224  
Investments, fair value 3,224   3,224  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value     25,287  
Purchase/merger      
Interest     0  
Sales/maturity/expiration     0  
Net realized (loss) from security transactions     0  
Net change in unrealized appreciation (depreciation) on investments     (22,063)  
Investments, fair value 3,224   3,224  
Investments, fair value 3,224   3,224  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 15 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     455  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (397)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Series C Preferred Stock [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     0  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 26,856,187   26,856,187  
Investments, fair value [1] $ 0   $ 0  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 20 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     136  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (119)  
Investments, fair value [1] $ 17   $ 17  
Shares held (in shares) [1] 150,000   150,000  
Investments, fair value [1] $ 17   $ 17  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 16 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     455  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (397)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Term Note 2 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     1,818  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (1,586)  
Investments, fair value [1] $ 232   $ 232  
Shares held (in shares) [1] 2,000,000   2,000,000  
Investments, fair value [1] $ 232   $ 232  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 21 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     318  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (277)  
Investments, fair value [1] $ 41   $ 41  
Shares held (in shares) [1] 350,000   350,000  
Investments, fair value [1] $ 41   $ 41  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 17 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     455  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (397)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 18 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     182  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (159)  
Investments, fair value [1] $ 23   $ 23  
Shares held (in shares) [1] 200,000   200,000  
Investments, fair value [1] $ 23   $ 23  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 1 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     9,966  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (8,696)  
Investments, fair value [1] $ 1,270   $ 1,270  
Shares held (in shares) [1] 10,961,129   10,961,129  
Investments, fair value [1] $ 1,270   $ 1,270  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 19 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     636  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (555)  
Investments, fair value [1] $ 81   $ 81  
Shares held (in shares) [1] 700,000   700,000  
Investments, fair value [1] $ 81   $ 81  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 2 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     1,182  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (1,031)  
Investments, fair value [1] $ 151   $ 151  
Shares held (in shares) [1] 1,300,000   1,300,000  
Investments, fair value [1] $ 151   $ 151  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 3 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     454  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (396)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 4 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     455  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (397)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 5 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     682  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (595)  
Investments, fair value [1] $ 87   $ 87  
Shares held (in shares) [1] 750,000   750,000  
Investments, fair value [1] $ 87   $ 87  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 6 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     455  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (397)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 7 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     909  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (793)  
Investments, fair value [1] $ 116   $ 116  
Shares held (in shares) [1] 1,000,000   1,000,000  
Investments, fair value [1] $ 116   $ 116  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 8 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     454  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (396)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 9 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     364  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (318)  
Investments, fair value [1] $ 46   $ 46  
Shares held (in shares) [1] 400,000   400,000  
Investments, fair value [1] $ 46   $ 46  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Term Note [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     2,728  
Purchase/merger [1]     0  
Interest     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (2,380)  
Investments, fair value [1] $ 348   $ 348  
Shares held (in shares) [1] 3,000,000   3,000,000  
Investments, fair value [1] $ 348   $ 348  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 10 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     455  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (397)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 11 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     909  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (793)  
Investments, fair value [1] $ 116   $ 116  
Shares held (in shares) [1] 1,000,000   1,000,000  
Investments, fair value [1] $ 116   $ 116  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 12 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     455  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (397)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 13 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     455  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (397)  
Investments, fair value [1] $ 58   $ 58  
Shares held (in shares) [1] 500,000   500,000  
Investments, fair value [1] $ 58   $ 58  
IntraOp Medical Corp. [Member] | Medical Devices Sector [Member] | Convertible Debt 14 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     909  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (793)  
Investments, fair value [1] $ 116   $ 116  
Shares held (in shares) [1] 1,000,000   1,000,000  
Investments, fair value [1] $ 116   $ 116  
Wrightspeed Inc [Member] | Automotive Sector [Member]        
Investments, fair value     0  
Investments, fair value 0   0  
Investments, fair value 0   0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value     0  
Purchase/merger     0  
Interest     0  
Sales/maturity/expiration     0  
Net realized (loss) from security transactions     (24,169,015)  
Net change in unrealized appreciation (depreciation) on investments     24,129,015  
Investments, fair value 0   0  
Investments, fair value 0   0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 15 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (165,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     165,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 20 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,000,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,000,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Common Stock [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     0  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 69,102   69,102  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 16 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     40,000  
Net realized (loss) from security transactions [1]     (40,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     0  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 21 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,000,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,000,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 17 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (700,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     700,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 22 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,000,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,000,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 18 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (300,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     300,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 23 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,000,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,000,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 1 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,000,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,000,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 24 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,200,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,200,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 2 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,000,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,000,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 25 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,400,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,400,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 3 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,000,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,000,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 26 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (250,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     250,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 4 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (200,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     200,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 27 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (400,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     400,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 5 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (185,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     185,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 28 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (375,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     375,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 6 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (65,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     65,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 29 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (400,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     400,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 7 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (250,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     250,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 30 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (1,050,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     1,050,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 8 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (250,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     250,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 31 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (900,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     900,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 9 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (2,000,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     2,000,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 32 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (750,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     750,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 33 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (4,929,015)  
Net change in unrealized appreciation (depreciation) on investments [1]     4,929,015  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 10 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (250,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     250,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 34 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (125,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     125,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 11 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (250,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     250,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 35 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (100,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     100,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 12 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (250,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     250,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 13 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (250,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     250,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Series AA Preferred Stock [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     0  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 60,733,693   60,733,693  
Investments, fair value [1] $ 0   $ 0  
Wrightspeed Inc [Member] | Automotive Sector [Member] | Convertible Debt 14 [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     (135,000)  
Net change in unrealized appreciation (depreciation) on investments [1]     135,000  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 0   0  
Investments, fair value [1] $ 0   $ 0  
EQX Capital, Inc [Member] | Equipment Leasing Sector [Member]        
Investments, fair value     29,466  
Investments, fair value 23,173   23,173  
Investments, fair value 23,173   23,173  
EQX Capital, Inc [Member] | Equipment Leasing Sector [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value     29,466  
Interest     0  
Net realized (loss) from security transactions     0  
Net change in unrealized appreciation (depreciation) on investments     (6,293)  
Investments, fair value 23,173   23,173  
Investments, fair value 23,173   23,173  
EQX Capital, Inc [Member] | Equipment Leasing Sector [Member] | Common Stock [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     0  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     0  
Investments, fair value [1] $ 0   $ 0  
Shares held (in shares) [1] 100,000   100,000  
Investments, fair value [1] $ 0   $ 0  
EQX Capital, Inc [Member] | Equipment Leasing Sector [Member] | Series A Preferred Stock [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value [1]     29,466  
Purchase/merger [1]     0  
Interest [1]     0  
Sales/maturity/expiration [1]     0  
Net realized (loss) from security transactions [1]     0  
Net change in unrealized appreciation (depreciation) on investments [1]     (6,293)  
Investments, fair value [1] $ 23,173   $ 23,173  
Shares held (in shares) [1] 1,930,000   1,930,000  
Investments, fair value [1] $ 23,173   $ 23,173  
Revasum, Inc [Member] | Semiconductor Equipment Sector [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Purchase/merger     0  
Interest     0  
Sales/maturity/expiration     0  
Net realized (loss) from security transactions     0  
Net change in unrealized appreciation (depreciation) on investments     0  
Investments, fair value 0   0  
Investments, fair value 0   0  
Revasum, Inc [Member] | Semiconductor Equipment Sector [Member] | Investment, Affiliated Issuer, Controlled 1 [Member]        
Investments, fair value     0  
Investments, fair value        
Revasum, Inc [Member] | Semiconductor Equipment Sector [Member] | Chess Depositary Interests (CDIs) [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Purchase/merger [1],[2]     0  
Interest [1],[2]     0  
Sales/maturity/expiration [1],[2]     0  
Net realized (loss) from security transactions [1],[2]     0  
Net change in unrealized appreciation (depreciation) on investments [1],[2]     0  
Investments, fair value [1],[2] $ 0   $ 0  
Shares held (in shares) [1],[2] 39,774,889   39,774,889  
Investments, fair value [1],[2] $ 0   $ 0  
Revasum, Inc [Member] | Semiconductor Equipment Sector [Member] | Chess Depositary Interests (CDIs) [Member] | Investment, Affiliated Issuer, Controlled 1 [Member]        
Investments, fair value [1],[2]     0  
Investments, fair value        
UCT Coatings, Inc. [Member] | Advanced Materials Sector [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value     260,497  
Interest     0  
Sales/maturity/expiration     0  
Net realized (loss) from security transactions     0  
Net change in unrealized appreciation (depreciation) on investments     (88,969)  
Investments, fair value 171,528   171,528  
Investments, fair value 171,528   171,528  
UCT Coatings, Inc. [Member] | Advanced Materials Sector [Member] | Common Stock [Member] | Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value     260,497  
Purchase/merger     0  
Interest     0  
Sales/maturity/expiration     0  
Net realized (loss) from security transactions     0  
Net change in unrealized appreciation (depreciation) on investments     (88,969)  
Investments, fair value $ 171,528   $ 171,528  
Shares held (in shares) 1,500,000   1,500,000  
Investments, fair value $ 171,528   $ 171,528  
[1] Controlled Investments.
[2] CDI: CHESS Depositary Interests